A396118 Consider the square spiral with its cells numbered starting at 0. Four players take turns and place knights at the smallest unoccupied cell not attacked by an existing knight of a different player. Sequence lists squares occupied by the third player.

2, 5, 20, 38, 43, 56, 57, 62, 65, 70, 88, 90, 104, 105, 112, 114, 127, 131, 152, 163, 176, 182, 184, 190, 195, 202, 230, 232, 234, 236, 238, 258, 261, 280, 282, 295, 297, 299, 305, 332, 336, 344, 354, 370, 372, 374, 380, 382, 390, 394, 399, 406, 416, 430, 448

Offset

1,1

Links

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, PARI program

Prog

(PARI) \\ See Links section.

Crossrefs

Cf. A392177, A396116, A396117, A396119, A396120, A396121.

Sequence in context: A192164 A244087 A395647 * A361134 A056726 A176042

Adjacent sequences: A396115 A396116 A396117 * A396119 A396120 A396121

Keyword

nonn

Author

Rémy Sigrist, May 20 2026

Status

approved